Changeset 7859

From Brede Johansen, "Here's a fix to the changes regarding the new dispose() function. The
last primary node inside a push-pop level would not get the dispose()
call. This would result in information from some ancillary records,
like the matrix (transform), being lost.

Changes are made to the latest version in the repository.

Thanks to Terry for the help to find and fix the bug and test the changes."